The company sells software to enterprises, government agencies and individuals who want to make sure their mobile phone calls are private. Its Cellcrypt Mobile product is a downloadable, phone-based application that encrypts VoIP (voice over Internet Protocol) calls all the way from one handset to the other. Unlike other cell encryption systems, it allows users to make calls pretty much as they would normally, and even to use international roaming, according to Ian Meakin, Cellcrypt's vice president of marketing.

Versions of Cellcrypt Mobile are already available for Nokia N-Series and E-Series phones and many Windows Mobile devices, and by the end of June the company will introduce a client for BlackBerry phones, Meakin said. Meanwhile, Cellcrypt announced this week it has opened an office in Palo Alto, California, to address growing demand for its products in North and South America, Meakin said. The company develops its software for various platforms using standard tools.